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        <title>PHPExcel Reader Example #15</title>

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        <h1>PHPExcel Reader Example #14</h1>
        <h2>Reading a Large CSV file in "Chunks" to split across multiple Worksheets</h2>
        <?php
        /** Include path * */
        set_include_path(get_include_path() . PATH_SEPARATOR . '../../../Classes/');

        /** PHPExcel_IOFactory */
        include 'PHPExcel/IOFactory.php';


        $inputFileType = 'CSV';
        $inputFileName = './sampleData/example2.csv';

        /**  Define a Read Filter class implementing PHPExcel_Reader_IReadFilter  */
        class chunkReadFilter implements PHPExcel_Reader_IReadFilter {

            private $_startRow = 0;
            private $_endRow = 0;

            /**  Set the list of rows that we want to read  */
            public function setRows($startRow, $chunkSize) {
                $this->_startRow = $startRow;
                $this->_endRow = $startRow + $chunkSize;
            }

            public function readCell($column, $row, $worksheetName = '') {
                //  Only read the heading row, and the rows that are configured in $this->_startRow and $this->_endRow
                if (($row == 1) || ($row >= $this->_startRow && $row < $this->_endRow)) {
                    return true;
                }
                return false;
            }

        }

        echo 'Loading file ', pathinfo($inputFileName, PATHINFO_BASENAME), ' using IOFactory with a defined reader type of ', $inputFileType, '<br />';
        /**  Create a new Reader of the type defined in $inputFileType  * */
        $objReader = PHPExcel_IOFactory::createReader($inputFileType);


        echo '<hr />';


        /**  Define how many rows we want to read for each "chunk"  * */
        $chunkSize = 100;
        /**  Create a new Instance of our Read Filter  * */
        $chunkFilter = new chunkReadFilter();

        /**  Tell the Reader that we want to use the Read Filter that we've Instantiated  * */
        /**    and that we want to store it in contiguous rows/columns  * */
        $objReader->setReadFilter($chunkFilter)
                ->setContiguous(true);


        /**  Instantiate a new PHPExcel object manually  * */
        $objPHPExcel = new PHPExcel();

        /**  Set a sheet index  * */
        $sheet = 0;
        /**  Loop to read our worksheet in "chunk size" blocks  * */
        /**  $startRow is set to 2 initially because we always read the headings in row #1  * */
        for ($startRow = 2; $startRow <= 240; $startRow += $chunkSize) {
            echo 'Loading WorkSheet #', ($sheet + 1), ' using configurable filter for headings row 1 and for rows ', $startRow, ' to ', ($startRow + $chunkSize - 1), '<br />';
            /**  Tell the Read Filter, the limits on which rows we want to read this iteration  * */
            $chunkFilter->setRows($startRow, $chunkSize);

            /**  Increment the worksheet index pointer for the Reader  * */
            $objReader->setSheetIndex($sheet);
            /**  Load only the rows that match our filter into a new worksheet in the PHPExcel Object  * */
            $objReader->loadIntoExisting($inputFileName, $objPHPExcel);
            /**  Set the worksheet title (to reference the "sheet" of data that we've loaded)  * */
            /**    and increment the sheet index as well  * */
            $objPHPExcel->getActiveSheet()->setTitle('Country Data #' . (++$sheet));
        }


        echo '<hr />';

        echo $objPHPExcel->getSheetCount(), ' worksheet', (($objPHPExcel->getSheetCount() == 1) ? '' : 's'), ' loaded<br /><br />';
        $loadedSheetNames = $objPHPExcel->getSheetNames();
        foreach ($loadedSheetNames as $sheetIndex => $loadedSheetName) {
            echo '<b>Worksheet #', $sheetIndex, ' -> ', $loadedSheetName, '</b><br />';
            $objPHPExcel->setActiveSheetIndexByName($loadedSheetName);
            $sheetData = $objPHPExcel->getActiveSheet()->toArray(null, false, false, true);
            var_dump($sheetData);
            echo '<br />';
        }
        ?>
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